T. Grosdidier et al., Influence of atomised powder characteristics on texture and microstructuredevelopment in extruded A1-8Fe-4Ni base alloys, MAT SCI E A, 267(1), 1999, pp. 71-81
The texture and microstructure of as-extruded Al-7.7Fe-4Ni and Al-8.2Fe-4.3
Ni-2.8Zr (wt.%) alloys reinforced by large volume fractions (> 30 vol.%) of
coherent intermetallics was studied. It is shown that the texture and micr
ostructure developed in the as-extruded alloys is very sensitive to charact
eristics of the rapidly solidified powders. In particular, variations in po
wder microstructure and associated hardness are responsible for heterogeneo
us deformation which leads to the formation of a banded structure consistin
g of alternate coarse and fine microstructure characterised by a major [111
] fibre texture of the Al-matrix. This texture of the Al-matrix is coupled
to a texture of the coherent intermetallic phase. On contrast. more homogen
eous deformation results in a more homogeneous microstructure with fairly r
andom texture for both the Al and tau phases. (C) 1999 Elsevier Science S.A
. All rights reserved.